Asymmetric Reduction of Chiral Pyruvamide with Sodium Borohydride

Abstract
Several amides of pyruvic acid with (S)-amines were reduced with sodium borohydride (NBH) in several alcohols and N-[(R)-lactoyl]-(S)-amines were obtained in excess. When the reductions were carried out in methanol or ethanol in the presence of metallic salt, N-[(S)-lactoyl]-(S)-amines were obtained in asymmetric yields up to 22%.